In D&D (all editions I know of, which'd be 2e, 3.5e, and 5e although 1e and 4e answers would be helpful to understand the evolution of this), a flying character can be knocked Prone, which causes them to start falling out of the sky. However, from a simulationist perspective, it is unclear what the actual flight state of that character (let us assume the character has functioning wings for argument's sake, as a non-winged magic flyer has no options besides turning into a projectile when rendered prone in mid-air) would be. Was it intended to represent a ballistic, "your wings just fell off" fall, or is it closer to a mush or aerodynamic stall, where the character's wings are still operable, but no longer generating adequate lift to keep the character in the air? Or is it meant to encompass both of these states, as well as other semi-controlled descents, such as spins?
I'm looking for Rules-as-Intended (i.e. designer intent) documentation here, and I'm looking for answers from multiple editions, instead of focusing in on a single edition here, to try to get a better picture of how this was developed over time, as I do not know if certain intents were prompted by specific playtests, etal.